There is no support for wrapping a single channel to multiple rows like you’d need to on a 32x32/8 panel. I will be fixing this in a future SmartMatrix Library release, but I realized it’s not an easy fix, and I haven’t had time to work on it recently, so I’m sorry to say it won’t be supported soon. I’ll post here when there’s an update: SmartMatrix with 1/4 scan hub75 panels - #4 by guillaume.s